- 根目录:
- drivers
- staging
- vt6656
- datarate.c
/*
* Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* File: datarate.c
*
* Purpose: Handles the auto fallback & data rates functions
*
* Author: Lyndon Chen
*
* Date: July 17, 2002
*
* Functions:
* RATEvParseMaxRate - Parsing the highest basic & support rate in rate field of frame
* RATEvTxRateFallBack - Rate fallback Algorithm Implementaion
* RATEuSetIE- Set rate IE field.
*
* Revision History:
*
*/
#include "tmacro.h"
#include "mac.h"
#include "80211mgr.h"
#include "bssdb.h"
#include "datarate.h"
#include "card.h"
#include "baseband.h"
#include "srom.h"
#include "rf.h"
/* static int msglevel = MSG_LEVEL_DEBUG; */
static int msglevel =MSG_LEVEL_INFO;
const u8 acbyIERate[MAX_RATE] =
{0x02, 0x04, 0x0B, 0x16, 0x0C, 0x12, 0x18, 0x24, 0x30, 0x48, 0x60, 0x6C};
#define AUTORATE_TXOK_CNT 0x0400
#define AUTORATE_TXFAIL_CNT 0x0064
#define AUTORATE_TIMEOUT 10
void s_vResetCounter(PKnownNodeDB psNodeDBTable);
void s_vResetCounter(PKnownNodeDB psNodeDBTable)
{
u8 ii;
/* clear statistics counter for auto_rate */
for (ii = 0; ii <= MAX_RATE; ii++) {
psNodeDBTable->uTxOk[ii] = 0;
psNodeDBTable->uTxFail[ii] = 0;
}
}
/*+
*
* Routine Description:
* Rate fallback Algorithm Implementaion
*
* Parameters:
* In:
* pDevice - Pointer to the adapter
* psNodeDBTable - Pointer to Node Data Base
* Out:
* none
*
* Return Value: none
*
-*/
#define AUTORATE_TXCNT_THRESHOLD 20
#define AUTORATE_INC_THRESHOLD 30
/*+
*
* Description:
* Get RateIdx from the value in SuppRates IE or ExtSuppRates IE
*
* Parameters:
* In:
* u8 - Rate value in SuppRates IE or ExtSuppRates IE
* Out:
* none
*
* Return Value: RateIdx
*
-*/
u16
RATEwGetRateIdx(
u8 byRate
)
{
u16 ii;
/* erase BasicRate flag */
byRate = byRate & 0x7F;
for (ii = 0; ii < MAX_RATE; ii ++) {
if (acbyIERate[ii] == byRate)
return ii;
}
return 0;
}
/*+
*
* Description:
* Parsing the highest basic & support rate in rate field of frame.
*
* Parameters:
* In:
* pDevice - Pointer to the adapter
* pItemRates - Pointer to Rate field defined in 802.11 spec.
* pItemExtRates - Pointer to Extended Rate field defined in 802.11 spec.
* Out:
* pwMaxBasicRate - Maximum Basic Rate
* pwMaxSuppRate - Maximum Supported Rate
* pbyTopCCKRate - Maximum Basic Rate in CCK mode
* pbyTopOFDMRate - Maximum Basic Rate in OFDM mode
*
* Return Value: none
*
-*/
void RATEvParseMaxRate(struct vnt_private *pDevice,
PWLAN_IE_SUPP_RATES pItemRates, PWLAN_IE_SUPP_RATES pItemExtRates,
int bUpdateBasicRate, u16 *pwMaxBasicRate, u16 *pwMaxSuppRate,
u16 *pwSuppRate, u8 *pbyTopCCKRate, u8 *pbyTopOFDMRate)
{
int ii;
u8 byHighSuppRate = 0, byRate = 0;
u16 wOldBasicRate = pDevice->wBasicRate;
u32 uRateLen;
if (pItemRates == NULL)
return;
*pwSuppRate = 0;
uRateLen = pItemRates->len;
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate Len: %d\n", uRateLen);
if (pDevice->byBBType != BB_TYPE_11B) {
if (uRateLen > WLAN_RATES_MAXLEN)
uRateLen = WLAN_RATES_MAXLEN;
} else {
if (uRateLen > WLAN_RATES_MAXLEN_11B)
uRateLen = WLAN_RATES_MAXLEN_11B;
}
for (ii = 0; ii < uRateLen; ii++) {
byRate = (u8)(pItemRates->abyRates[ii]);
if (WLAN_MGMT_IS_BASICRATE(byRate) &&
(bUpdateBasicRate == true)) {
/*
* add to basic rate set, update pDevice->byTopCCKBasicRate and
* pDevice->byTopOFDMBasicRate
*/
CARDbAddBasicRate((void *)pDevice, RATEwGetRateIdx(byRate));
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate AddBasicRate: %d\n", RATEwGetRateIdx(byRate));
}
byRate = (u8)(pItemRates->abyRates[ii]&0x7F);
if (byHighSuppRate == 0)
byHighSuppRate = byRate;
if (byRate > byHighSuppRate)
byHighSuppRate = byRate;
*pwSuppRate |= (1<<RATEwGetRateIdx(byRate));
}
if ((pItemExtRates != NULL) && (pItemExtRates->byElementID == WLAN_EID_EXTSUPP_RATES) &&
(pDevice->byBBType != BB_TYPE_11B)) {
unsigned int uExtRateLen = pItemExtRates->len;
if (uExtRateLen > WLAN_RATES_MAXLEN)
uExtRateLen = WLAN_RATES_MAXLEN;
for (ii = 0; ii < uExtRateLen ; ii++) {
byRate = (u8)(pItemExtRates->abyRates[ii]);
/* select highest basic rate */
if (WLAN_MGMT_IS_BASICRATE(pItemExtRates->abyRates[ii])) {
/*
* add to basic rate set, update pDevice->byTopCCKBasicRate and
* pDevice->byTopOFDMBasicRate
*/
CARDbAddBasicRate((void *)pDevice, RATEwGetRateIdx(byRate));
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"ParseMaxRate AddBasicRate: %d\n", RATEwGetRateIdx(byRate));
}
byRate = (u8)(pItemExtRates->abyRates[ii]&0x7F);
if (byHighSuppRate == 0)
byHighSuppRate = byRate;
if (byRate > byHighSuppRate)
byHighSuppRate = byRate;
*pwSuppRate |= (1<<RATEwGetRateIdx(byRate));
/* DBG_PRN_GRP09(("ParseMaxRate : HighSuppRate: %d, %X\n",
RATEwGetRateIdx(byRate), byRate)); */
}
}
if ((pDevice->byPacketType == PK_TYPE_11GB)
&& CARDbIsOFDMinBasicRate((void *)pDevice)) {
pDevice->byPacketType = PK_TYPE_11GA;
}
*pbyTopCCKRate = pDevice->byTopCCKBasicRate;
*pbyTopOFDMRate = pDevice->byTopOFDMBasicRate;
*pwMaxSuppRate = RATEwGetRateIdx(byHighSuppRate);
if ((pDevice->byPacketType==PK_TYPE_11B) || (pDevice->byPacketType==PK_TYPE_11GB))
*pwMaxBasicRate = pDevice->byTopCCKBasicRate;
else
*pwMaxBasicRate = pDevice->byTopOFDMBasicRate;
if (wOldBasicRate != pDevice->wBasicRate)
CARDvSetRSPINF((void *)pDevice, pDevice->byBBType);
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Exit ParseMaxRate\n");
}
/*+
*
* Routine Description:
* Rate fallback Algorithm Implementaion
*
* Parameters:
* In:
* pDevice - Pointer to the adapter
* psNodeDBTable - Pointer to Node Data Base
* Out:
* none
*
* Return Value: none
*
-*/
#define AUTORATE_TXCNT_THRESHOLD 20
#define AUTORATE_INC_THRESHOLD 30
void RATEvTxRateFallBack(struct vnt_private *pDevice,
PKnownNodeDB psNodeDBTable)
{
struct vnt_manager *pMgmt = &pDevice->vnt_mgmt;
u16 wIdxDownRate = 0;
int ii;
int bAutoRate[MAX_RATE] = {true, true, true, true, false, false, true,
true, true, true, true, true};
u32 dwThroughputTbl[MAX_RATE] = {10, 20, 55, 110, 60, 90, 120, 180,
240, 360, 480, 540};
u32 dwThroughput = 0;
u16 wIdxUpRate = 0;
u32 dwTxDiff = 0;
if (pMgmt->eScanState != WMAC_NO_SCANNING)
return; /* Don't do Fallback when scanning Channel */
psNodeDBTable->uTimeCount++;
if (psNodeDBTable->uTxFail[MAX_RATE] > psNodeDBTable->uTxOk[MAX_RATE])
dwTxDiff = psNodeDBTable->uTxFail[MAX_RATE] - psNodeDBTable->uTxOk[MAX_RATE];
if ((psNodeDBTable->uTxOk[MAX_RATE] < AUTORATE_TXOK_CNT) &&
(dwTxDiff < AUTORATE_TXFAIL_CNT) &&
(psNodeDBTable->uTimeCount < AUTORATE_TIMEOUT)) {
return;
}
if (psNodeDBTable->uTimeCount >= AUTORATE_TIMEOUT) {
psNodeDBTable->uTimeCount = 0;
}
for (ii = 0; ii < MAX_RATE; ii++) {
if (psNodeDBTable->wSuppRate & (0x0001<<ii)) {
if (bAutoRate[ii] == true) {
wIdxUpRate = (u16) ii;
}
} else {
bAutoRate[ii] = false;
}
}
for (ii = 0; ii <= psNodeDBTable->wTxDataRate; ii++) {
if ( (psNodeDBTable->uTxOk[ii] != 0) ||
(psNodeDBTable->uTxFail[ii] != 0) ) {
dwThroughputTbl[ii] *= psNodeDBTable->uTxOk[ii];
if (ii < RATE_11M) {
psNodeDBTable->uTxFail[ii] *= 4;
}
dwThroughputTbl[ii] /= (psNodeDBTable->uTxOk[ii] + psNodeDBTable->uTxFail[ii]);
}
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate %d,Ok: %d, Fail:%d, Throughput:%d\n",
ii, (int)psNodeDBTable->uTxOk[ii], (int)psNodeDBTable->uTxFail[ii], (int)dwThroughputTbl[ii]);
}
dwThroughput = dwThroughputTbl[psNodeDBTable->wTxDataRate];
wIdxDownRate = psNodeDBTable->wTxDataRate;
for (ii = psNodeDBTable->wTxDataRate; ii > 0;) {
ii--;
if ( (dwThroughputTbl[ii] > dwThroughput) &&
(bAutoRate[ii]==true) ) {
dwThroughput = dwThroughputTbl[ii];
wIdxDownRate = (u16) ii;
}
}
psNodeDBTable->wTxDataRate = wIdxDownRate;
if (psNodeDBTable->uTxOk[MAX_RATE]) {
if (psNodeDBTable->uTxOk[MAX_RATE] >
(psNodeDBTable->uTxFail[MAX_RATE] * 4) ) {
psNodeDBTable->wTxDataRate = wIdxUpRate;
}
} else { /* adhoc, if uTxOk(total) == 0 & uTxFail(total) == 0 */
if (psNodeDBTable->uTxFail[MAX_RATE] == 0)
psNodeDBTable->wTxDataRate = wIdxUpRate;
}
if (pDevice->byBBType == BB_TYPE_11A) {
if (psNodeDBTable->wTxDataRate <= RATE_11M)
psNodeDBTable->wTxDataRate = RATE_6M;
}
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"uTxOk[MAX_RATE] %d, uTxFail[MAX_RATE]:%d\n",(int)psNodeDBTable->uTxOk[MAX_RATE], (int)psNodeDBTable->uTxFail[MAX_RATE]);
s_vResetCounter(psNodeDBTable);
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rate: %d, U:%d, D:%d\n", (int)psNodeDBTable->wTxDataRate, (int)wIdxUpRate, (int)wIdxDownRate);
return;
}
/*+
*
* Description:
* This routine is used to assemble available Rate IE.
*
* Parameters:
* In:
* pDevice
* Out:
*
* Return Value: None
*
-*/
u8
RATEuSetIE (
PWLAN_IE_SUPP_RATES pSrcRates,
PWLAN_IE_SUPP_RATES pDstRates,
unsigned int uRateLen
)
{
unsigned int ii, uu, uRateCnt = 0;
if ((pSrcRates == NULL) || (pDstRates == NULL))
return 0;
if (pSrcRates->len == 0)
return 0;
for (ii = 0; ii < uRateLen; ii++) {
for (uu = 0; uu < pSrcRates->len; uu++) {
if ((pSrcRates->abyRates[uu] & 0x7F) == acbyIERate[ii]) {
pDstRates->abyRates[uRateCnt ++] = pSrcRates->abyRates[uu];
break;
}
}
}
return (u8)uRateCnt;
}